Detections
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Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-003860)
medium Nessus Plugin ID 288503
Synopsis
The Unity Linux host is missing one or more security updates.Description
The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003860 advisory.A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2.
Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.
Tenable has extracted the preceding description block directly from the Unity Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected kernel package.See Also
http://www.nessus.org/u?b05695f1
https://bugzilla.redhat.com/show_bug.cgi?id=1822077
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
http://www.nessus.org/u?1ed41626
https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
https://lists.openwall.net/linux-kernel/2020/03/24/1803
https://security-tracker.debian.org/tracker/CVE-2020-12826
https://security.netapp.com/advisory/ntap-20200608-0001/
https://usn.ubuntu.com/4367-1/
https://usn.ubuntu.com/4369-1/
https://usn.ubuntu.com/4391-1/
https://www.openwall.com/lists/kernel-hardening/2020/03/25/1
Plugin Details
Severity: Medium
ID: 288503
File Name: unity_linux_UTSA-2026-003860.nasl
Version: 1.2
Type: local
Published: 1/16/2026
Updated: 1/17/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.2
CVSS v2
Risk Factor: Medium
Base Score: 4.4
Temporal Score: 3.4
Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2020-12826
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Temporal Score: 4.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
Required KB Items: Host/local_checks_enabled, Host/UOS-Server/release, Host/UOS-Server/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 1/16/2026
Vulnerability Publication Date: 5/12/2020
Reference Information
CVE: CVE-2020-12826